Electric furnace.



ELECTRI- FUPJN.

YORK, N, Y., AESSPCGNR @PS5 NEVI YR-K.

,Y hesitez. @die Lhe pot or Crucible 10. T e. cover 23 is hinged at the back edge as s Wn at 26 and provided with a. iital fastening 27 at the front edge to hold it oeked While the charge is being melted. The casing 19 is considerably larger than the furnace proper, and the space between the two is filled as shown at 19- by suitable insulating material such as tire clay, tire brick, quartz or the like, in order that there may be as little loss as possible by radiation.

It will be seen that the current Will be led in through the carbon terminals 13 and that the .resistance afforded by the Walls ot il l the pot 10 will cause the latter to be highly heated so as to melt the contents.'

The furnace is tipped by means of ahand ivheel 28 or equivalent lever attached to a horizontal shaft 29, and the latter is mounted in suitable post-s 30 and provided with a gear or pinion 31 meshing with a curved rack 32 on the bottom of the casing 19, so that to tilt the furnace and discharge the contents, the cover Q3 can be lifted and 5 the furnace tipped over by simply turning the shaft Q9, and it will be observed that this action will cause the switch arms 15 to be disengaged from the contacts 17, thus breaking the circuit through the furnace, While the reverse movement of the shaft Q9 will tip the furnace back into operative position as shown in Fig. 3 and cause the switch arms to again frietionally engage the contacts 17.

ln order that there shall be no unnecessary st-rain on the furnace by reason of the weight ot the charge it is permitted to rest on a block 33 of tire clay or other nonconv ductor, which is held in the casing 19, and

noaa-ieee the supporting brick or block can be adiusted by means of the screw all.

It will be seen that 1 have provided a very convenient furnace which is automatically cut in and out ot circuit by tipping it., that the heat is applied and conserved at the point Where the actual melting occurs, and that the furnace can be very easily operated.

I claim 1. A resistance electrical lfurnace having` a tilting body, a melting chamber or cruel ble carried by thc body and of higher electric resistance than other parts ot the body, and a lining for said Crucible which lining is a non-conductor of electricity when cold but a conductor when highly heated. 2. An electric resistance furnace compris ing an inclosing oscillating casing, a melt ing pot contained in the, asing and arranged withits open top near the top ot' the casiterminals connecting with the lovver part et' the pot and projecting outward through oppos-itc Walls ot the casing. an insulating packing or filling between the pot and the casing Wall, laterally extending switch arms on the ends ot the terminals, and contacts to engage the switch arms.

3. In an electric furnace, the combinatitm with the casing and its contained furnace, the latter having terminals extending lthrough the casing walls, of an adjustable insulating support between the bottom ot thc tui-nace and the bottom xvall of the casing.

MICHAEL lt. CONLEY. litnesscs 1 humax B. llvrtnixsox, 'l`nonas` 'll Sincm'n. 

